Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 1

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A fly wheel originally at rest is to attain an angular velocity of $36 rad s^{- 1}$ in $6 s$ . The total angle it turns through which it turns in the $6 s$ is:-

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Important Questions on Rotational Mechanics

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 2

A rotating rod starts from rest and acquires rotational speed

600

revolutions/minute in

2 seconds

with constant angular acceleration. The angular acceleration of the rod is

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 3

Point masses of

1, 2, 3

and

10 kg

are lying at the points

(0, 0), (2 m, 0) (0, 3 m)

and

(- 2 m, - 2 m)

respectively in

x - y

plane. Find the moment of inertia of this system about

y -

axis. (in

kg m^{2}

).

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 4

The moment of inertia of a ring and a disc of the same mass about their diameters are the same. What will be the ratio of their radii?

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 5

Two rings have their moments of inertia in the ratio

4 : 1

and their diameters are in the ratio

4 : 1

. Find the ratio of their masses.

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 6

Two bodies of masses

1 kg

and

2 kg

are attached to the ends of a

2 m

long weightless rod. This system is rotating about an axis passing through the middle point of the rod and perpendicular to the length. Calculate the M.I. of the system.

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 7

If the moment of inertia of a disc about an axis tangential and parallel to its surface be

I

, then what will be the moment of inertia about an axis tangential but perpendicular to the surface?

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 8

A disc is recast into a thin hollow cylinder of the same radius. Which will have a larger moment of inertia? Explain.

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>BEGINNER'S BOX - 2>Q 9

Why spokes are fitted in a cycle wheel?